Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 699 · 40 questions

The fast method (Casting out nines): Find the nine-check number of each number: add the digits until one digit is left. Do the same sum (× or +) with those digits and shrink the result to one digit too. Shrink the given answer. Different → wrong. Same → it passes the check.

1. 1.Check with nines: 12 × 25 = 292. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 78 × 43 = 3354. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 524 + 913 = 1437. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 513 + 616 = 1129. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 32 × 31 = 992. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 98 × 61 = 5978. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 81 × 98 = 7941. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 364 + 396 = 767. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 92 × 30 = 2760. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 775 + 406 = 1183. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 34 × 75 = 2553. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 62 × 79 = 4898. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 50 × 64 = 3200. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 916 + 851 = 1767. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 503 + 798 = 1301. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 98 × 21 = 2058. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 30 × 72 = 2159. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 287 + 750 = 1030. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 171 + 261 = 432. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 78 × 72 = 5623. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 34 × 78 = 2650. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 36 × 49 = 1772. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 896 + 560 = 1460. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 67 × 83 = 5565. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 98 × 89 = 8722. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 54 × 60 = 3240. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 508 + 451 = 960. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 41 × 44 = 1804. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 545 + 351 = 896. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 812 + 254 = 1070. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 961 + 256 = 1217. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 54 × 27 = 1451. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 62 × 23 = 1430. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 14 × 66 = 924. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 88 × 95 = 8360. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 24 × 86 = 2059. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 809 + 864 = 1673. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 930 + 755 = 1685. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 91 × 48 = 4368. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 51 × 78 = 3978. Correct or wrong? (a) wrong (b) correct

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